One of the most important design factors for FPS mooring systems with polyester ropes is the maximum peak load and excursion during benign- and storm weather conditions. The main rope characteristic which determines the peak load and influences the maximum offset is the dynamic modulus. Several people and institutes (1: Del Vecchio 1998, 2: TTI /NEL JIP 97-98) have made efforts to define the dynamic modulus and to measure relevant data. Del Vecchio was the first attempt to define a formula which covers a lot of test parameters. In the present paper this formula serves as a starting point, while the test data has been obtained from tests with a random loading mode (as was already suggested by Del Vecchio). It will be demonstrated that the mean load is the main parameter determining the dynamic modulus. The main test to be satisfied in order to arrive this conclusion is that a sufficient number of cycles have to be conducted (> 10,000 cycles). A second conclusion is that under these test conditions good predictions (error <10%) can be made from small-scale tests to full size tests.
Elastic modulus characteristics of polyester mooring ropes
1999
5 Seiten, 6 Quellen
Aufsatz (Konferenz)
Englisch
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